What is AST in HST?
Hawaii Standard Time is 6 hours behind
Convert a time
HST — Hawaii Standard Time
10:00 pm
HST, Fri, the previous day
- Time in Halifax
- 4:29:22 AM
- Time in Honolulu
- 10:29:22 PM
- Difference
- −6 h
- Next clock change
- March 14, 2027
When the difference changes
Atlantic Time and Hawaii Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – March 14, 2027Hawaii Standard Time is 6 hours behind
- March 14, 2027 – November 7, 2027Hawaii Standard Time is 7 hours behind
- November 7, 2027 – onwardsHawaii Standard Time is 6 hours behind
Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.
Daylight saving
Atlantic Time
Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ADT after that.
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
AST to HST conversion table
Every hour of Saturday, November 7, 2026, converted from Atlantic Time to Hawaii Standard Time. 6 of the 24 hours fall on a different calendar day in Honolulu, which is marked.
- 12:00 am AST
- 6:00 pm HST−1 day
- 1:00 am AST
- 7:00 pm HST−1 day
- 2:00 am AST
- 8:00 pm HST−1 day
- 3:00 am AST
- 9:00 pm HST−1 day
- 4:00 am AST
- 10:00 pm HST−1 day
- 5:00 am AST
- 11:00 pm HST−1 day
- 6:00 am AST
- 12:00 am HST
- 7:00 am AST
- 1:00 am HST
- 8:00 am AST
- 2:00 am HST
- 9:00 am AST
- 3:00 am HST
- 10:00 am AST
- 4:00 am HST
- 11:00 am AST
- 5:00 am HST
- 12:00 pm AST
- 6:00 am HST
- 1:00 pm AST
- 7:00 am HST
- 2:00 pm AST
- 8:00 am HST
- 3:00 pm AST
- 9:00 am HST
- 4:00 pm AST
- 10:00 am HST
- 5:00 pm AST
- 11:00 am HST
- 6:00 pm AST
- 12:00 pm HST
- 7:00 pm AST
- 1:00 pm HST
- 8:00 pm AST
- 2:00 pm HST
- 9:00 pm AST
- 3:00 pm HST
- 10:00 pm AST
- 4:00 pm HST
- 11:00 pm AST
- 5:00 pm HST
Scheduling between the two
Working hours overlap from 3:00 pm to 6:00 pm AST, which is 9:00 am to 12:00 pm HST. Anything inside that window falls in the normal working day at both ends.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
Atlantic Time (AST) is used in Nova Scotia, New Brunswick and Puerto Rico
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving
Other conversions
- HST to AST
- AST to UTC
- AST to GMT
- AST to EST
- AST to CST
- AST to MST
- AST to PST
- AST to AKST
- AST to BST
- AST to CET
- AST to IST
- AST to CST (China)
- AST to JST
- AST to AEST
- AST to Mexico City
- AST to BRT
- AST to ART
- AST to EET
- AST to WET
- AST to MSK
- AST to TRT
- AST to SAST
- AST to WAT
- AST to EAT
- AST to GST
- AST to PKT
- AST to ICT
- AST to WIB
- AST to SGT
- AST to HKT
- AST to KST
- AST to PHT
- AST to AWST
- AST to ACST
- AST to NZST
- All zones